So I have no way of finding out the total number of hours I worked for my past jobs..Do I just guess the total hours? Also, for community service where I only participate once a year, such as, Relay for Life, what would I put for average hours a week?
Just estimate to the best of your abilities. There should be a space to put the daily/weekly hour and also the total number of hours you did. So you did 8 hrs a day and the total was like 30 for your 3 years.